Machine for making nut-locking keys.



PATENTBD JUNE 9, 1908.

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MACHINE F09 MAKING NUT LocKING KEYS.

APPLICATION FILED 'SEPI'. 13. 1907.

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PATENIED JUNE 9, 1908. MACHINE FOR MAKING NUT LOCKING KEYS.

v APPLICATION FILED SEPT. 13. 1907.

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l e755 @jo /c arrow MW Mr/ifea' No. 890,492. PATENTED .TUNE 9, 1908. lJ. H. BURROWS.

MACHINE FOR MAKING NUT LOCKING KEYS.

APPLICATION FILED BBPT.13. 1907. 3 BEEETS SHEBT 3l UNITED sTATEs PATENToEErcE JOSEPH H. BURROWS, OF BROCKTON, MASSACHUSETTS, ASSIGNOR OFONE-HALF TO L. F.

GARFIELD, OF BROOKTON, MASSACHUSETTS.

Specification of Letters Patent.

Patented June 9, 1908.

Application filed September 13, 1907. Serial No. 392,676.

To all whom it may concern:

Be it known that I, JosEPn H. BUEEows, of Brockton, in the county ofPlymouth and State of Massachusetts, have invented certain new anduseful Improvements in Machines for Making Nut-Locking Keys, of whichthe following is a specification.

This invention has for its object to provide a machine for making keysadapted to be inserted in slots in internally-threaded nuts, the nuthaving a slot which opens into the bolt hole, and the key being formedto enter the slot, and to rock on the bottom thereof, the inner end andupper edge of the key being beveled to form a sharp cutting inner endadapted to indent the thread of a bolt with which the nut is engaged,and a relatively thin or reduced upper edge having beveled sides adaptedto conform to lips formed on the sides of the slot by upsetting themetal of the nut at opposite sides of the slot. When the key is insertedin a nut, it is adapted to be tipped on the bottom of the slot, so thatits cutting edge may stand outside the bolt hole prior to theapplication of the nut to the bolt, and may be forced into the bolt holeto indent the thread of the nut, and prevent the rotation of the latterafter it has been screwed to place on the bolt.

The invention consists in the improvements hereinafter described in anorganized machine adapted to rapidly and economically manufacture keysfor the purpose above indicated. l

Of theaccompanying drawings, forming a part of thisspecification,-Figure1 represents a sectional elevation of a machineembodying my invention. Fig. 2 represents a sectional view of theshearing die which forms the cutting edge of the key. Figs. 3, 4, 5, 5arepresent different views of a completed key constructed by my improvedmachine. Fig. 6 represents a transverse section through a portion of themachine, and elevations of other parts hereinafter referred to. Figs. 7,8, 9, 10 and 11 represent fragmentary views illustrating diiferent partsof the key-forming operation. Fig. 12 represents a top plan view of aportion of the machine, certain parts being shown in section. Fig. 13represents a section online 13 of Fig. 12. Figs. 14 and 15 representviews of parts of the machine hereinafter referered to.

The same letters of reference indicate the same parts in all thefigures.

In the drawings, 12 represents the bed of the machine, on which aremounted standards 13 supporting a driving shaft 15, and having guidesfor a reciprocating cross head 16, which is connected by links or rods17 with cranks on the crank shaft, the cross head being reciprocatedtoward and from the bed. Mounted on the bed is a guide 18 for the strip19, from which the keys 20 are cut, said guide havingfacings 21 of feltor other suitable material for cleaning the sides of the strip. 22 22represent feed rolls which engage the sides of the strip and feed itforward step by step to a point between a male punching die 23 and afemale punching die 24. Said dies are formed to sever the keys 2() fromthe strip, each key having a teat 25 at its lower portion and inclinedfaces 26 and 27 at opposite sides of the teat. Means hereinafterdescribed are employed for forming beveled faces 28 28 on the upper edgeof each strip, and for forming beveled faces 29 29 on the outer end ofthe strip, said beveled faces meeting to form an acute-angled cuttingedge adapted to indent the threads of a bolt. The beveled faces 28,however, do not meet, but simply reduce the thickness of the upper edge-of the key, and conform to lips which are formed by upsetting the metalof the nut at opposite sides of the mouth of the slot, said lipsoverhanging the beveled faces V28 and preventing the key from leavingthe slot. The beveled faces 28 are formed by a pair of dies 30, whichare pivoted at 31 to a holder or carrier axed to the cross head 16, andare arranged so that their lower ends meet, said lower ends beingyieldingly pressed together by springs 32. W'hen the cross headdescends, the dies 30 strike the upper edge of the strip 19, and removetherefrom enough material to form the beveled faces 28. The dies 30 haveshort inclined faces 33, the outer ends of which strike the upper edgeof the strip while the dies are descending, and act to shear awayortions of the material of the strip. As t ie dies descend, theyseparate and move downwardly along the sides of the strip 19, as shownin Figs. 8 and 9. The dies 30 are arranged at some distance from thepoint where the punching dies act on the strip so that a plurality ofseries of beveled faces 28 are formed on the strip, as indicated in Fig.11. The feed movements of the strip are so timed that a pair of thebeveled faces 28 are brought by each feed into alinement with thepunching dies, so that the key cut from the strip by the punching diesincludes two of the beveled faces 28 positioned on the key as shown inFig. 5. The advancing end of the strip is acted upon before the key issevered, by a vertically-reciprocating die 34, the form of which incross section is shown in Fig. 2, said die having a V-shaped recesswhich intersects the lower end of the die, and forms a V-shaped cuttingedge adapted to form the beveled faces 29 which constitute the cuttingend of the key. The dies 30 and 34 are adjustably mounted on a carrier57 affixed to the cross head. The portion of the strip 19 which is actedon by the beveling dies 30 and 34 and the punching dies 23 and 24, issupported by a guide 58 which is grooved to form a track and a lateralsupport for the strip, said guide having a raised portion 59 (Fig. 1),one edge of which has a recess 6() which fits one side of the malepunching die, said raised portion extending across one side of the strip19. 61 represents a finger attached to the carrier 57, and arranged tobear on the opposite side of the strip 19 from that which bears on theraised portion of the guide 59, said finger supporting the strip againstthe thrust of the male punching die.

The punching dies 23 and 24 are reciprocated simultaneously in oppositedirections so that they approach the strip from opposite sides, the malepunching die passing through the strip and entering the female punchingdie, forcing the attached key into the latter. Means for reciprocatingthe punching dies, as here shown, include bell crank levers 37 pivotedat 36 to the frame of the machine, the longer arms of said levers havingslots 38 which are slidable on pivotal blocks 39 carried by the crosshead 16. The shorter arms of the levers 37 enter recesses in the holdersor carriers 40 which support the punching dies 23 and 24, said carriersbeing movable in guides 41 on the bed of the mach'ine. The feed rolls 22which feed the strip forward, are intermittently operated by means of aratchet 42 affixed to the shaft 54 of one of the feed rolls, an arm 43mounted to oscillate on said shaft, and provided with a vdog 44 engagingthe ratchet, and a lever 45 pivoted at 46 to the frame of the machine,and having a slot 47 in one arm engaging the arm 43, its other armhaving a trundle roll 48 which engages a cam 49 on the driving shaft 15.A spring 53 acting on the lower end of the lever 45, holds the trundleroll 48 in engagement with the cam 49. The rotation of the driving shaftoscillates the lever 45 and arm 43, and thus causes an intermittentrotation of the ratchet 42 and thefeed roll attached thereto, the twofeed rolls being connected by gears so that they rotate simultaneouslyin opposite directions.

The operation is as follows: After each feed movement of the strip,which is accomplished while the cross head is raised, the cross headdescends, causing the dies 3() to form the beveled faces 28 on the upperedge of the strip, and at the same time causing the die 34 to descendacross the advancing end of the strip, and form the beveled faces 29thereon, the die 34 at the same time removing a chip or waste portion 50(Fig. 11). After the cross head rises, and before the next feed movementof the strip, the punching dies act to sever a key from the strip, thekey having the form shown in Figs. 3, 4 and 5. The keys as fast as theyare formed, are forced into the female die 24 and through a channel 51(Fig. 13) extending backwardly from said die, the keys falling one byone through an outlet 52 in the bed of the machine.

It Will be seen that the key as punched from the strip, includes thesharpened indenting edge formed by the die 34 and two of the beveledfaces formed by the dies 30. It will also be seen that the movement ofthe dies 30 and 34 across the path of the strip is edgewise of thestrip, while the movement of the punching dies is crosswise of thestrip.

My invention is not limited to the specific construction here shown, andthe same may be modified in various ways without departing from thespirit of the invention. For example, the punching dies may be formed topunch out a key 20, which instead of having a teat 25 has a recess 250adapted to engage and rock on a corresponding projection formed on'thebottom of the slot in the nut.

I claim:

1. A machine of the character stated, comprising a strip guide, meansfor intermittently feeding a strip along the guide, a sharpening diemovable across the path of the strip, edgewise of the latter, andadapted to sever a waste piece from the forward end of the strip, andthereby sharpen said end, and means for punching a key from thesharpened end portion of the strip.

2. A machine of the character stated, comprising a strip guide, meansfor intermittently feeding a strip along the guide, a sharpening diemovable across the path of the strip edgewise of the latter, and adaptedto sever a waste piece from the advancing end of the strip, and therebysharpen the forward end of the strip, cooperating punching dies movableacross the path of the strip crosswise of the latter, and adapted tosever a key from the sharpened end portion of the strip, and mechanismfor successively operating the sharpening die and punching dies.

3. In combination, a strip support and guide, means for feeding a stripintermittently thereon, a sharpening die movable edgewise of the stripacross the path of the latter, and adapted to sever a waste piece fromthe advancing end of the strip, and

thereby sharpen said end to form an indenting edge, a pair of punchingdies movable crosswise of the strip across' the path thereof, andadapted to sever a key from the strip, said key including the saidindenting edge, and mechanism for successively operating said sharpeningdie and punching dies.A

4. In combination, a strip support and guide, means for feeding a stripintermittently thereon, a sharpening die movable edgewise of the stripacross the path of the latter, and adapted to sever a waste piece fromthe advancing end of the strip, and thereby sharpen said end, a pair ofpunching dies movable crosswise of the strip across the path thereof,and adapted to sever from the strip a key, including the said sharpenedend, a reciprocating cross head carrying the sharpening die, andconnections between the crosshead and the punching dies adapted tooperate said dies after the operation of the sharpening die.

5. In combination, a strip support and guide, means for feeding a stripintermittently thereon, a sharpening die movable edgewise of the strip,across the path of the latter, and adapted to sever a waste piece fromthe advancing end of the strip, and thereby sharpen said end, a pair ofpunching dies movable crosswise of the strip across the path thereof,and adapted to sever from the strip a key, including the said sharpenedend, a reciprocating crosshead carrying the sharpening die, and bellcrank levers connected at the end portions with the crosshead andpunching dies, and pivoted to fixed supports between said portions,whereby a movement of the crosshead in one direction, operates thesharpening die, while an opposite movenlrient of the crosshead operatesthe punching c les.

6. In combination, a strip support and guide, means for feeding a stripintermittently thereon, a pair of beveling dies adapted to form beveledfaces on one edge of the strip, a sharpening die movable edgewise of thestrip across the path of the latter, and adapted to sever a waste piecefrom the advancing end of the strip, and thereby sharpen said end, acarrier supporting said beveling dies and sharpening die, a pair ofpunching dies movable crosswise ofthe strip across the path thereof, andadapted to sever from the strip a key, including the said beveled facesand the sharpened end of the strip, a crosshead supporting said carrier,operating connections between the crosshead and the punching dies, andmeans for reciprocating the crosshead to operate the several dies.

7. In combination, a strip support and guide, means for feeding a stripintermittently thereon, a pair of beveling dies mov- 'able edgewise ofthe strip across the path of the latter, said dies being pivotallyconnected to their carrier, and adapted to form beveled faces on oneedge of the strip, and a pair of punching dies movable crosswise of thestrip across the path thereof, and adapted to sever a key from thestrip, said 'key including said indenting edge.

8. In combination, a strip support and guide, means for feeding a stripintermittently thereon, a pair of beveling dies movable edgewise of thestrip across the path of the latter, and adapted to form beveled faceson one edge of the strip, a sharpening die movable edgewise of the stripacross the path of the latter, and adapted to form an indenting edge onthe strip, and a pair of punching dies movable crosswise of the stripacross the path thereof, and adapted to sever a key from the strip, saidkey including the said beveled edge faces and indenting edge.

In testimony whereof I have affixed my signature, in presence of twowitnesses.

' JOSEPH II. BURROWS.

